What to Change While the Walls Are Open
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What to Change While the Walls Are Open

Open walls are the cheapest they will ever be to work in. Here is everything worth upgrading while the drywall is off — plumbing, wiring, insulation, blocking, and future rough-ins.

July 9, 2026 2 min read

Every time a wall comes open for a remodel, you get a one-time discount on every other upgrade behind that wall. Rerunning a supply line, adding a dedicated circuit, or swapping insulation costs a fraction of what it would as a standalone project — because the demo and the drywall are already paid for. Here is what we recommend homeowners tackle while the studs are exposed.

Upgrade the old plumbing

If your home still has polybutylene, galvanized steel, or undersized copper feeding the room you are remodeling, this is the moment to replace it. PEX runs cost pennies compared to the drywall repair required to do it later. Any waste line older than 40 years should also be inspected — cast iron cracks and old ABS fittings fail.

Run new dedicated electrical lines

Kitchens want dedicated 20-amp circuits for the microwave, disposal, dishwasher, and fridge. Bathrooms want their own 20-amp GFCI. Home offices and media walls need clean power. Pulling that wire while the walls are open is a few hours of labor; doing it later means fishing lines through finished drywall.

Replace insulation in exterior walls

Old fiberglass batts sag, get wet, and lose their R-value. If the exterior wall is open, upgrade to properly installed batts or open-cell spray foam. In bathrooms, insulate interior walls too — it kills sound between the toilet and the bedroom next door.

Add blocking for the future

Two-by-fours screwed between studs cost almost nothing and save you every time you want to hang something heavy. Standard spots: grab bars in the shower, TVs on media walls, floating vanities, upper cabinets, closet shelving, curtain rods, and towel bars.

Rough-in for what is coming next

Even if you are not installing it today, run the pipe or wire while you can:

  • A gas stub for a future range or outdoor grill
  • 240V and conduit for an EV charger in the garage
  • A cold-water line and vent for a future tankless water heater
  • Low-voltage conduit for cameras, speakers, or a future smart panel
  • A dryer vent path if the laundry might move

Deal with any moisture or pest damage

Open walls are also your only chance to see the framing. Water stains, termite trails, or rot need to be fixed now, not covered back up. This is where a good contractor earns their fee — they stop and tell you, instead of drywalling over it.


The theme is simple: open walls are the discount window. Skipping these upgrades to save a few hundred dollars today usually costs thousands the next time the drywall comes off. If you have a remodel coming up and want a clear list of what is worth doing while the walls are open, contact Modern Builders for a quote — we build it into every scope we write.